WPF how to detach event hooks in UserControls

I have a WPF UserControl that contains a ComboBox. I need to attach an event listener to the ComboBox.Items collection.

public MyUserControl()
{
    InitializeComponent();

    ((INotifyCollectionChanged)combo开发者_StackOverflow中文版Box.Items).CollectionChanged +=
        ComboBoxItemsChanged;
}

But I cant seem to figure out how to detach it. Or is that handled automatically when the entire control is garbage collected?

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Implement IDisposable interface and detach event handler in Dispose method